Monster Guardian of Gremory (Highschool DxD )

Andariel is the second strongest dragon out there, only surpassed by Great Red but only few knew of her existence. Since hundreds of years she has been living deep in the familiar forest only minding her own business until one day a small redheaded girl stumbled into the clearing she lives on.
A promise was made that day, but soon forgotten by the girl. What will happen if they one day meet again?

Disclaimer: I do not own Highschool DxD or any of the pictures that will be used here (including the cover)!